نتایج جستجو برای: neutron emission
تعداد نتایج: 223305 فیلتر نتایج به سال:
This paper describes a neutron detector designed by INFN-Sanità group of Rome. The detector ful"lls all the requirements of cold fusion experiments and, on the other hand, can operate in several kind of experiments involving neutron detection, even when signi"cant, variable and not taggable background is present. As a matter of fact, it is suitable to detect every source emitting multi-MeV neut...
Coulomb versus nuclear break-up of 11 Be halo nucleus in a non perturbative framework. Abstract The 11 Be break-up is calculated using a non perturbative time-dependent quantum calculation. The evolution of the neutron halo wave function shows an emission of neutron at large angles for grazing impact parameters and at forward angles for large impact parameters. The neutron angular distribution ...
Quasi-periodic oscillations (QPOs) have been discovered in the X-ray emission of many neutron stars and black holes. The QPOs with frequencies ∼> 300 Hz are thought to be produced near the surfaces of neutron stars and the event horizons of black holes. I first summarize some of the most important properties of the QPOs seen in neutron star and black hole systems. I then review some of the mode...
The instability of the O nucleus with respect to decay through the twoneutron channel is investigated. It is shown that this isotope, unobserved in the fragmentation experiments, can exist as a narrow resonance in the system O + 2n. A role of deformation in formation of the neutron-drip line in the region N ∼ 20 is discussed. The structure of nucelei near the neutron-drip line possesses interes...
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Coulomb versus nuclear break-up of 11 Be halo nucleus in a non perturbative framework. Abstract The 11 Be break-up is calculated using a non perturbative time-dependent quantum calculation. The evolution of the neutron halo wave function shows an emission of neutron at large angles for grazing impact parameters and at forward angles for large impact parameters. The neutron angular distribution ...
A young neutron star with large spin-down power is expected to be closely surrounded by an e pair plasma maintained by the conversion of γ-rays associated with the star’s polar-cap and/or outer-gap accelerators. Cyclotron-resonance scattering by the e and e within several radii of such neutron stars prevents direct observations of thermal X-rays from the stellar surface. Estimates are presented...
An extensive programme was successfully carried out during the 1995 to 1998 NMS programme to recalibrate and model by Monte Carlo simulations the characteristics of two NPL long counters that are routinely used to standardise neutron fluences [Ta98,Ta00] for neutron energies above 500 keV. The present work is a continuation of it in that the counters responses and effective centres have been me...
The first excited state in neutron-rich 23 O was observed in a (2p1n) knockout reaction from 26 Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22 O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of fur...
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